<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
  "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>WebGL Origin Restrictions Conformance Tests</title>
<script>
function create3DContext(canvas, attributes)
{
    if (!canvas)
        canvas = document.createElement("canvas");
    var context = null;
    try {
        context = canvas.getContext("webgl", attributes);
    } catch(e) {}
    if (!context) {
        try {
            context = canvas.getContext("webkit-3d", attributes);
        } catch(e) {}
    }
    if (!context) {
        try {
            context = canvas.getContext("moz-webgl", attributes);
        } catch(e) {}
    }
    if (!context) {
        throw "Unable to fetch WebGL rendering context for Canvas";
    }
    return context;
}

function description(msg)
{
    // For MSIE 6 compatibility
    var span = document.createElement("span");
    span.innerHTML = '<p>' + msg + '</p><p>On success, you will see a series of "<span class="pass">PASS</span>" messages, followed by "<span class="pass">TEST COMPLETE</span>".</p>';
    var description = document.getElementById("description");
    if (description.firstChild)
        description.replaceChild(span, description.firstChild);
    else
        description.appendChild(span);
}

function debug(msg)
{
    var span = document.createElement("span");
    document.getElementById("console").appendChild(span); // insert it first so XHTML knows the namespace
    span.innerHTML = msg + '<br />';
}

function escapeHTML(text)
{
    return text.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/\0/g, "\\0");
}

function testPassed(msg)
{
    debug('<span><span class="pass">PASS</span> ' + escapeHTML(msg) + '</span>');
}

function testFailed(msg)
{
    debug('<span><span class="fail">FAIL</span> ' + escapeHTML(msg) + '</span>');
}

function assertMsg(assertion, msg) {
    if (assertion) {
        testPassed(msg);
    } else {
        testFailed(msg);
    }
}

// Checks if function throws an exception.
function causedException(func) {
  var hadException = false;
  try {
    func();
  } catch(e) {
    hadException = true;
  }
  return hadException;
}

var testVideo = false;

function init() {
  var video = document.getElementById("video");
  if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
  }
  video.src = "http://localhost:8000/resources/test.ogv";
  video.addEventListener("playing", runTests);
  video.play();
  testVideo = true;
}

function runTests() {
  description("This test ensures WebGL implementations follow proper same-origin restrictions.");
  var img = document.getElementById("img");
  assertMsg(img.width > 0 && img.height > 0, "img was loaded");

  function makeTexImage2D(gl, src) {
    return function() {
      gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, src);
    };
  }

  function makeTexSubImage2D(gl, src) {
    return function() {
      gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE, src);
    };
  }

  function makeReadPixels(gl) {
    return function() {
      var buf = new Uint8Array(4);
      gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, buf);
    };
  }

  function makeToDataURL(canvas) {
    return function() {
      var data = canvas.toDataURL();
    }
  }

  var canvas1 = document.getElementById("canvas1");
  var gl = create3DContext(canvas1);

  debug("");
  debug("check that an attempt to upload an image from another origin throws an exception.");
  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 256, 256, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
  assertMsg(causedException(makeTexImage2D(gl, img)),
            "texImage2D with cross-origin image should throw exception.");
  assertMsg(causedException(makeTexSubImage2D(gl, img)),
            "texSubImage2D with cross-origin image should throw exception.");

  debug("check that readPixels and toDataURL continue to work against this canvas.");
  assertMsg(!causedException(makeReadPixels(gl)),
            "readPixels should never throw exception -- not possible to dirty origin of WebGL canvas.");
  assertMsg(!causedException(makeToDataURL(canvas1)),
            "should not throw exception by toDataURL for WebGL canvas, which should stay origin clean.");

  debug("check that an attempt to upload a tainted canvas throws an exception.");
  var canvas2 = document.getElementById("canvas2");
  var ctx2d = canvas2.getContext("2d");
  ctx2d.drawImage(img, 0, 0);
  assertMsg(causedException(makeToDataURL(canvas2)),
            "should throw exception by toDataURL for NON origin clean canvas.");
  assertMsg(causedException(makeTexImage2D(gl, canvas2)),
            "texImage2D with NON origin clean canvas should throw exception.");
  assertMsg(causedException(makeTexSubImage2D(gl, canvas2)),
            "texSubImage2D with NON origin clean canvas should throw exception.");

  debug("check that readPixels and toDataURL continue to work against this canvas.");
  assertMsg(!causedException(makeReadPixels(gl)),
            "readPixels should never throw exception -- not possible to dirty origin of WebGL canvas.");
  assertMsg(!causedException(makeToDataURL(canvas1)),
            "should not throw exception by toDataURL for WebGL canvas, which should stay origin clean.");

  if (testVideo) {
    debug("check that an attempt to upload a video from another origin throws an exception.");
    var video = document.getElementById("video");
    assertMsg(causedException(makeTexImage2D(gl, video)),
              "texImage2D with cross-origin video should throw exception.");
    assertMsg(causedException(makeTexSubImage2D(gl, video)),
              "texSubImage2D with cross-origin video should throw exception.");

    debug("check that readPixels and toDataURL continue to work against this canvas.");
    assertMsg(!causedException(makeReadPixels(gl)),
              "readPixels should never throw exception -- not possible to dirty origin of WebGL canvas.");
    assertMsg(!causedException(makeToDataURL(canvas1)),
              "should not throw exception by toDataURL for WebGL canvas, which should stay origin clean.");
  }

  debug('<br /><span class="pass">TEST COMPLETE</span>');
  if (window.testRunner)
    testRunner.waitUntilDone();
  if (window.testRunner) {
    testRunner.notifyDone();
  }
}
</script>
</head>
<body onload="init()">
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas1"></canvas>
<canvas id="canvas2"></canvas>
<img id="img" src="http://localhost:8000/local/resources/abe.png" style="display:none;">
<video id="video" style="display:none;"/>
</body>
</html>
